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Fr Hesse has a whole conference on this issue somewhere on the internet. If i find it, i will post it.

Did the SSPX, at the outset, use the 1962 Missal, or an earlier one?

I'm reasonably certain that +Lefebvre used a mid sixties transitional missal at first, without insisting that SSPX priests who did otherwise conform to that. This removed prayers at the foot of the altar, the Last Gospel, Epistle in the vernacular and able to be read by a lay man or seminarian in minor orders, prayer and dismissal switched, with possible concelebration as a notable change. +Lefebvre made considerable efforts not to effect any sort of break with Rome, approving all the docuмents of V2, out of loyalty, for example (although the official bio notes that Paul VI seemed to think +Lefebvre rejected two docuмents, although perhaps the Abp did retract any approved he had given). I understand '62 as a character of showing Paul that the SSPX was not dealing in schism. The various iterations of the transitional missal were thankfully discarded (Solesmes possibly uses it as a conventual Mass) as nearly all the bad dynamic equivalence Novus Ordo Missae translations removed in 2011 originate from that era. It indicated that SSPX were no radicals bent of breaking over small matters (although the Easter liturgical changes were honestly terrible).